金剛經纂要刊定記 4.141

4.141

This has two meanings: first, proving the principle that all marks are devoid of marks. Because marks arise dependent on thought, the essence of awakening is already free from thought, how much more so from marks? Second, proving the principle that the loci where all marks are absent are everywhere the Tathāgata. The mark that is free from thought is called the dharmakāya. Since the dharmakāya is equal to empty space, how could empty space ever have marks? Being signless and impartial, it gathers all marks, which is precisely the dharmakāya. Later the text says, "Being free from all marks is called the Buddhas," and it also says, "The Tathāgata is the meaning of the suchness of all dharmas"; hence it says "not only, etc."